Speed-counter.



u. KOHLER & 0. 5160mm.

SPEED COUNTER.

APPLICATION FILED APR- 16. 1914.

1 ,27 5 ,269 Patented Aug. 13, 1918.

2 SHEETS-SHEET I- u. K-OHLER & 0. STUCKLIN.

SPEED COUNTER.

APPLICATION FILED APR. 16. 1914.

1,275,269. Patented Aug. 13, 1918* 2 SHEETS-SHEET 2.

' STATES PAgENT ()FFICE.

,ULI-IGE roam m M swoon-m, or am. wxrznanm. A mn ns T mm A. a. vomLsmncmm-wmxsrfirrn VON 6. Easter, IBEBITE, mm, A com anion or swxrzaamnn.

.srmcourm v Uncommon o; remit.

Patented Aug. 13, 1918 li lmtam111ml11 1:1116,1914. senalmaaam.

To all whom it concern:

Be it known that we, Umucn ,KOHLER and CHARLES Srficxnm, citizens of theSwiss Confederation, and both 'res1ding at Berne, Switzerland, haveinvented certamnew and useful Improvements in Speed-Counters, 0f 7 whichthe following is a, specification.-

The number of revolutions and the velocities of moving bodies weremeasured heretofore in two different ways, viz: firstly, by

means of sin: le counters'of revolutions, the time being slmultaneouslynoted, and, secondly, by means of tachometers. I

The'measurements according to the first method are liable to beincorrect on two grounds: Firstly, this method necessitates the counterbeing started at .the same monient as the reading of the watch'orclock,and this is always connected with an error owing to the two thoughtsinvolved, apart 1 from the error being liable to be increased by toorapidly and improperl pressing the counter against the mentioned errorsare increased. Further,

the psychological error mentioned above is repeated at the end of themeasurement, if

the measuring operation does not cease automatically.

The measurements according to the second mode of operation'by means ofhand tachometers are more rapid, almost instanlargedrscale, Fig. 8 is asection through the taneous, but are generally too inexact.

The most accurate tachometers on the so-' called positive principle, 6.6. those comprising. a pointer which is temporarily driven by clockwork,are not handy because too heavy and they are too complicated andtherefore too expensive; in addition, they require much power. Such atachometer is, for example, shown in Patent 730,298 of 1903. The handtachometers used most largely are based on the rotary pendulum or therotary magnetic field'princi le. These apparatus have to be empirical yadjusted and their accuracy is not uniform as they are influenced byinternal weakening forces or external chan es of temperature.

Another de ect of all ta hometers having art. of t e machine to bemeasured. Secon y, the duration of the one dial only is that theirmeasurements can take place at most durin one single revolution of thepointer whet er the division of anism adapted to be driven by thedriving shaft, we connect the indicating mechanism in suchjmanner by alocking member with the clockwork that it is liberated automaticallyonly during one single exactly predetermmed interval of time which is afractlon of the relative time of measurement.

To these ends, our invention consists in the construction, arrangementand combina-, tion of parts described hereinafter and pointed out in theclaims.

One illustrative embodiment of our in vention and modifications ofdetails thereof are represented by way of example in the accompanyingdrawings, wherein Figure 1 is a side elevation of a preferred form ofour improved speed counter showing the dial, Fig. 2 is a like viewthereof, enlarged, the dial having been removed, and Fig. 3 is'a sectiontaken on the line III-J11 in Fig. 2';

Fig. 4; shows details of the gearing, and Fig. 5 shows the same as seenfrom the right of'Fig. l;

' Figs. 6 and 7 aredetail views on an endevice shown in detail. 1

According to Fi s. 1 to 9, the speed coun- Fig. 7 and Fig. 9 shows a tercomprises a cy lndrical casing 1 into the interior of which projects adriving shaft 4 which carries on its outer end a threesided point 2 andon. its inner end a bevelgear 3. \This gear meshes .with a bevel-gear5-on whose shaft 5 is fastened a p1n1on 6.

bevel-gear 5. In consequence of the friction between the spring 8 andthe bevel-gear 5,

when the d rection of rotation of the driv flat-spring 8 bears in themiddle against the ing shaft changes the lever 7- carrying the gearwheels 9, 10 is turned from its one end position into the other. In theone end position of the lever 7 the gear wheel 9 meshes with a gearwheel 11 and in the other end position the gearwheel 10 meshes with agear wheel 12. These wheels 11 and 12 are directly positively connectedwlth one another, and owing to the rectifying device comprising themembers 5 to 10 .are always rotated in ever direction Rotatable aboutthe axle 11 of the gear wheel 11 is a two-armed lever 13 (Figs. 2, 4 and5) on whose one arm the Wheel 12 is journaled and on its other arm agear wheel 14. This gear wheel meshes on the one hand with a pinion 15rigidly connected with the gear wheel 11 and is rigidly. connected onthe other hand with a pinion 16. the one end position of the lever 13the P11110I1 16, and in the other end position the pinion 12 meshes witha gear wheel 17 of the indicating or pointer mechanism (Figs. 2 and 4).The ratio of the two speeds pointer wheel 17 is as 1 :10 so that in theone end position (Fig. 4) of the lever 13 the pointer wheel 17 isrotated ten times as quickly as in the position of the lever 13according to Fig. '2. Inthe foriner case the inner scale on the in .thelatter case the outer. J The lever-'13 is pulled by means of a coilspring 18 against a cam 19, theposition of which can be changed by meansof a grip 20 located outside the casing. As shown in Fig. 6, the pointerwheel 17 is loosely mounted on a sleeve 21 which is likewise free torotate on the shaft 22. The pointer wheel 17 is pressed by means of acoil spring 23 against a flange onthe sleeve 21,'so that the latter isrotated by friction. the sleeve 21 is screwed an arrestingdisk 24 havinga finely serrated eriphery, against which disk the ends 'of a h 25 bear;the middle portion of this s ring bears against a collar 22 on the sha22. In consequence of friction between the spring 25 and the collar 22'the shaft 22 is rotated when the disk 24 rotates.- The shaft 22 carriesa pointer 26 (Figs. 1 and3) which moves in operative relation with acomplete circular scale 27 on a dial 28 "mounted in the casing. Thescale 27 is such that the result of the measurement can-be read on itdirectly, 2'. a, without calculation. The shaft or axle of the pointercarries a pinion 29 which is positively connected by means of two gearwheels 30 and 31 with 'a gear wheel 32 whose. axle carries a pointer 33which rotates in operative relation with a] scale 34 and travels onedivision of the scale when the pointer 26, makes one completerevolution. The pointer 33 thus indicates up to 10 revolutlons of thepointer 26 during the same direction in whichthe driving shaft 4 isdriven.-

of the.

dial will be read and- On the one end ofv at spr ng" the measurement, sothat very high speeds or a large number ofrevolutions can be exactlymeasured or counted.

The pointer mechanism or the serrated wheel 24 is generally preventedfrom rotating by a double pawl 35, 35, which is yieldingly pressedagainst the periphery of the wheel 24. The end 35' of this pawl bearsagainst the periphery of a cam 36 having a recess 36'. When the pawltakes into this recess it also takes into the serration of the vWheel24, but if it is located outside the said recess it is then lifted clearof the periphery.

of this wheel and releases the same and the pointer mechanism. The cam36 is mounted on the same shaft as the escapement wheel 37 of a drivingmechanism or clockwork which is used for automatically releasing andarresting the pointer mechanism during an exactly predetermined intervalof time constituting a fraction of the relative time of measurement. Asclearly shown in Fig. 8,

between the escapement wheel 37 and the cam 36 is located a pinion 38provided with a cam 39. A pawl 40 is elastically pressed against theperiphery of this cam; this pawl is mounted on the escapement wheel. insuch manner that when the pinion 38 rotates in the one direction theescapement wheel remains stationary, whilst in the other direction ofrotation the pawl 40 abuts against the shoulder of the cam and therebyrotates the escapement wheel. A toothed sector 41 meshes with the pinion38. This sector carries a pin 42 against which bears a spring 43 whichtends to 'hold the sector 41 in the position shown in Fig. 2 orto rotatethe same into this position. The sector 41 can be turned against theaction of the spring 43 by pressure uponlan outwardly springpressedradial pin 44 whichprojects through the wall of the casing. After the in44 V has been released the'sector :41 or the riving --mechanism, which'com risesin addition to of which the pointer mechanism can be di-'rectly turned by hand and adjusted to zero,

for example. I,

Fig. 9 shows a disk" 58 to be placed over the point 2 for enablingtheperipheral velocity or the speed of travel of a member to i be measuredby the speed counter. The pe: riphery of the disk 58 is pressed againstthe periphery of the said member whose speed of rotation is to bemeasured.

The described speed counter operates as follows When the ointer has beenadjusted to zero the spec counter is connected with the shaft to bemeasured by ressing the point 2 into the center in the end of the shaft.The wheels, 3, 5, 6, 9, 10, 11, 12, 15, 14, 16 and 17 are rotated, whilethe pointer mechanism remains stationary in consequence of its beingarrested by the pawl 35, 35, and the clockwork is also stationary owingto its not being wound up. Then, by pressing the pin 44 inward thespring 43 is tensioned and the clockwork is wound up, the segment 41being turned backward. This segment rotates the pinion 38 and the cam 39firmly connected therewith rather more than one revolution backward, .sothat the pawl 40 mounted on the escapementwheel reliably takes behindthe projection of the cam 39. In this position the pawl 40 is ready torotate the wheel 37 and the cam 39 under the action of the spring 43exactly one revolution in the direction of the arrow shown in Fig. 2When the pin 44 is pressed inward insufficiently so that the spring 43,the escapement wheel 37 and the cam 36 cannot rotate forwardly acomplete revolution, then the pawl 40 is not located in front of theprojection of the cam and is therefore unable to rotate the cam when thepin 44 is released. Oonsequently the pointer mechanism is not releasedand no incomplete or incorrect measurement is made. In order to measureat all it is necessary to bring the pawl 40 into engagement with theprojection of the cam 39 so that when the pin 44 is released the cam 36actually rotatesone complete revolution. When the pointer mechanism hasbeen correctly'coupled with the shaft 4 for driving the same the pin 44is released, whereupon the clockwork is, driven, and the pointermechanism is released or the connection between the driving shaft 4 andthe pointer mechanism is automatically established. The clockwork is soregulated that this connection lasts exactly 3 seconds for example. Atthe end of this time, which is a fraction of the relative time ofmeasurement, i. e. that time over which the measurement extends e. 9.one minute, the connection between the driving mechanism and the pointermechanism is automatically broken or the latter mechanism is arrested.The result of the measurement can then be read a driving mechanism of apointer mecha nism adapted to be driven thereby, a locking membernormally holdin said pointer mechanism at rest, a rotata le cam disk.

adapted to temporarily withdraw said looking member, and a clock-workcontrolling the rotation of said cam disk the said looking member beingdirectly controlled by said cam disk so as to release the said pointermechanism only after said cam disk has obtained its normal regulatedspeed, the said cam disk after the completion of one revolution causingthe automatic arrest of the said clock-work.

2. In a speed counter the combination with a driving mechanism of apointer mechanism adapted to be driven thereby, a locking membernormally holding said pointer mechanism at rest, a clock-work comprisingan escape-ment wheel, a cam disk mounted on the shaft of said escapementwheel and adapted to temporarily withdraw said locking member, a cam inconnection with said escapement wheel, a pawl engaging said cam so as torotate it in one direction only, and a spring-actuated driving wheel,the said cam disk being so constructed and arranged as to control saidlocking member in such a manner to release the said ointer mechanismonly after the said cam disk has attained lts normal regulated speed.

3. In a speed counter the combination wlt-h a driving mechanism, of apointermechanism adapted to be driven thereby, a locking member normallyholding said pointer mech anism at rest, a clock-work comprising anescapement wheel, a cam disk mounted on the shaft of said escapementwheel and adapted to temporarily withdraw said locking member, a cam inconnection with said escapement wheel having a single projection, so asto carry with it the escapement wheel in one direction only, a springcontrolled sector for rotating said cam, a manually operated memberadapted to actm opposition to the'spring controlling said sector, thearrangement being such that the sald cam disk will be rotated towithdraw the said locking member thereby allowing the said pointermechanism to operate only when the said cam has been completely operatedwhereby the taking of a measurement in less than the predeterminedperiod of time is prevented.

In testimony whereof we aiiix our signatures in the presence of twowitnesses.

ULRICH KOHLER. ,oHARLEs s'rooKLIn. Witnesses:

Hans Rmnnnmmom, FREDERICK Moms.

